Extremism and American Politics: Abolitionist, Jihadis and Tea Parties Extremism and American Politics: Abolitionist, Jihadis and Tea Partiesdr-joel-olson-lecture-part-2dr-joel-olson-lecture-part-3dr-joel-olson-lecture-part-4dr-joel-olson-lecture-part-5 16 December 2010, Northern Arizona University